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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c20019b2abde0199fe4130e1aff0e021843739ff5eb35d4c60c6c8cbe7a520' 
  AND token = 'VkvEfDNB4RRtHgdLMF7mSLTax3jymx/EBMl1VKq8Db4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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