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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3371e4db1a0b2a3d0728325d2ddf0d97bf40da19372ef5942a2d6b639ec20e05' 
  AND token = 'SeB4A0cTN/IXjy5ZZDxaSNgUhzLolYjnh7H0EabmtR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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