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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e0134103272a14369d92d41928d5f46eb9d8ba7b6b0b6d1e0e096417ffe695' 
  AND token = 'EYydwx2julT98+hrTypxY+xP3E7YqbfN64qcTuyBPKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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