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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0d795e53d81a3a3e279e887c2c18916b213f7f2a0bcfb0d6291b8ed751b477' 
  AND token = '48zsq4ADxky8r9OcAj2s8howqFx8THP1xrML/XBDbg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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