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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eefd6c4c4146f44d9f1513dbc4c00ab890fc4af5be68aa81adc3adc69318e905' 
  AND token = 'mKJUqC8btGhMnGVqw2URxgdRe/6tz8xuGTsR07ZqKWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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