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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29cae7bf61980997fe27938715ada21a3899392c6d8a968431c45aa792356e02' 
  AND token = 'Y0yacXdfEizLPXjYa9ywL3yipH3oVaVn37K+SDob4as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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