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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf96f7eed2c1b182eef368ee44305e4f98d0a13f05e129864743e8e1e8d675e' 
  AND token = 'oom/tsfsVTbMABQ4QZ973EaVtor4ApQC2Si7T0cvmY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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