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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ba65721f61a29115233f75e39dbc45172d3a4f5dd4e3b6ac2e6b797f2b59a6' 
  AND token = 'Zb9e+f63953fhB+erYeHj3dNUiIJXnmmR6Cyck0+bBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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