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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d905a50dbc026a69a2c0e9367c0463e91ce24423e7808ef9e0bc885fac65f22' 
  AND token = 'TSnRhmWJ84scys0CU9G1CgWaykxqj5MttFHchn829y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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