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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cf4b0b05f06ecf8a885ad173e09b8783d20b32df0075a156f7363a0da6d1ca' 
  AND token = 'FrzaqS1kFuhFfrHxMjfT1R4GXNokanI05Y+jEY6E2i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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