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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b25c752e68b0da5dd4ed22ba84b2a1f6a790fef5b02e035897461262e42709' 
  AND token = '86DruEc/GPtpZnqvE9m58Xn1Ya2DMHM6oSeexaBq5Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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