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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '395febfd22cf203963b7623e1bdc2aa26f5573b7e9cd103fc3a71840e637457b' 
  AND token = 'GRNCCDQq114YwuChnLAb7ey3ohE2bWUZQ+8u8eCZ5JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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