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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdd937d1cd974d3d1e7d9b7beb4976b971ed4689dcb85bc7a7d970338cd514c' 
  AND token = 'cwjmP9WNLq91Yh8c4zdh+jbxniKBqgt1vjCzzHbJfIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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