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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d2ea6c366d3ea35c67c5b24e63c5a20aa929c242d7f67fed6735cae006baf8' 
  AND token = 'ZcCh93yeN+LQHx1iM2bBqnHj2xqX+q/lPi2b31oN2pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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