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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4605cd3d09ba8f48d4de8cd29a061064c97157007241d6a8182afc0b5ebb63ba' 
  AND token = 'mlUc1p2TbbsRg7VEUv85E3l9aWNVlXbvql+ye6PmzZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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