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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827c0a1313be8907b30ee4d75d72790775bc0e676f9a57a0479b356ea12ecaf0' 
  AND token = 'SZrM2WC2a2ZZpucUyQ60oz7QOsr3xeki0H1L9uZK5O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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