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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c5e673322315f30077ecc7c55ecb12e48a449c11c1ec8bad7ed7b602ad4413' 
  AND token = 'BpMLbFqj1ejwWe4Bh3xh1lmOMP768LJb/2qeZC8NEpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}