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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a0bea69822bb1eabd4824d2a8fe620db412ab251658d6e5e7a84202de4981b' 
  AND token = 'gMlIXHgmrfXA1to0Zuz1A9xiX0efAq+ecDDDgKZ/3bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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