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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f634d31e13cb172fe73321505587776f6ab91d1ee855503d6f8a5bdfc5c89a1' 
  AND token = 'saANODP8l6oIoyM0MOckXyVajERB6xGnQpEnPmHplwk=' 
  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"
    }
  }
}