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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d78051c9c3b6b5210ccca555760a99c3eef08e5ce41dd61be375335f838bb11' 
  AND token = 'A6FBJ/+yWxcdy7r0Zh8bFJZmAsrlDoL/L2lR2hc3Mgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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