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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0926a97887a46a4cfbce42dd7147a7923d30bbc3bb356e3db8d10cac44be1f3a' 
  AND token = 'KlBO0pSBHc1PmxgjangC8p45VJcbp2tF4mn7o8E8T9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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