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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df0122cef9af438f21508e9ff2642fbe8aa386bc650baac53e2ce859f6d2aa2' 
  AND token = 'uSUMhaofPK1dxgEnkx/NVJ9RHKZdSA5tczvJMfIhnK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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