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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2f5b83d02215905d3cd5a945c7efe6742aef88223c17e6f52927b54596de5c' 
  AND token = 'a7lQdD5o54nDiFTkJ/O0VFX31kD8tDo91Xwla26lWLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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