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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2430472c2c61488eee5d13fbdf6c10aafbb48274cde3bdc2ef621888617a1c1a' 
  AND token = 'BjUXagOt4rHEyG2ndtD6wQ9uLU8q94Ouf+pf3z3PiLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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