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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a144ce7117bc57a9bc68f754335cbd2f8ed784161a83ac67a44978d421f21b88' 
  AND token = '1sKt214ChPps8MAKK8t6GseYlrx6YrDPEM1PYJkmmI0=' 
  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"
    }
  }
}