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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1710b0377effa557060345e714363a22d2ecd22a0c47197c723bf284ea9d0bea' 
  AND token = 'lDhsc2GAQcHrH7S0h1mwfzDThx+2sSnG/6y3AOUX6Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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