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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6aaeedf793f15a6e678596a84b12f0e8af684152118667f86acc5a17c418ed' 
  AND token = 'OrgCXRXHaGKStUUfIXO4B/2Zj45Hy61UvFv39d2+/tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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