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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d56ba5d0ed047828cec8f8693ce2050c8a9808f9b3f7666b2be8919d473d46c' 
  AND token = 'r8wj+AHBYEsCSrFG+NiwS7fpirCI/riypJqqHOJOmT0=' 
  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"
    }
  }
}