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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88feb6e7a6750882f3366bf4d4b9995c0800571d3ec355ba2905eebcc140d619' 
  AND token = 'bOGKslcYR4gx9nWLm2grcvHnCeyyAG+z/cmdIp3C83Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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