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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47c4a88ab5f8e7ec806dd35e70e99a9968e52a2bb0aa5a9b62b2dd1b21eea38' 
  AND token = 'FkZhU9/tnwY1u4rtDrk11oeuxZZ0TO3T/K61JYHpdys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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