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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971170e762f90db1fd70e7ed32cb15aec1fe64f57c5436bf094d1c5e2b81d662' 
  AND token = 'vxT16D0j4UY3js4d++IIxS6uZq2QjdMkOsH6i4c8WU0=' 
  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"
    }
  }
}