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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a1c1c3595a3b88ab6a8f08e51234e720a9e1cbb3bd4036f8815ddacfdf6b34' 
  AND token = 'No0RG+iMbEiIm0T0+efjz/12Taum+CG2wCK2FQPg/5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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