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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e3bf945389a5bff1fac15002aea20ffbaa4a95c36d0f2e7cdf609f26fc2798' 
  AND token = 'fLPQStRWI4z5Yj8yj3WGqPHSUIDUIrdl6rIBG4nYyZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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