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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5ab0c896ae97e735d239855751a703e546f8507795a89003207d43fb399fe1' 
  AND token = '+uAoP6093AdXvnHhs36NLHY3ddDdZh1kLBZ9W1Ji1Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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