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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970606bf3e1a7e574be84aa309789cde49063e59b7d3e4822f85acf7a300315d' 
  AND token = 'Ir1Qz4RnrZHDmjnew/6oiFZXNkoG45bIrblFxuB2yk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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