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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c97966e64db99b9d838059dc2abcda02544ef63ec72a8acd79ea41af168a8a4' 
  AND token = '1ENvSoSTqROOf7eLEqsD6ckUToVI5IS8djsV9oteJYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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