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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dade3bd7c8082aa8da308bcb35f96611f01cbc1d3d6a10716a4895ed3a8ff7' 
  AND token = 'TXwHZyGgNaZE2D8NvU0A9B9aT0cVUcuI+kwnRpNtbJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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