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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9345a6d08890387b32f92a966d9ad868ef6761c53aeda6669a9bfa58880af8c8' 
  AND token = 'W9/1+5lesQH5Hbk1VmL7J7AWEd/krVvpYw+376otJu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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