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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124c50192695ad6ffba28f2222d92cf172f299861707b8e3e5db0336b9897f69' 
  AND token = 'EPLFYgEgEtf7h2KFLYWg/DIHAemk4sbkKtt0EQiSLF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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