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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0c2c60f82f5aab0b77e625316cc64ef06401d3e0194fba4df8bc1c8b90dcbd' 
  AND token = '1+hCkoE9OiKxGBrMhoAk934//Y83Vk5Fwe25N5VrBmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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