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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79dc8ea8250fc1117f475887953a984b0224fd5c5fe24dc64c4e3fef1341f2c' 
  AND token = '3VPNuIw5FZZVNE2msE2vCGr+AnXGLLQGaz/H74byexM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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