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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ce07d577eb71060a98a2b6e54a084d82e6a1c708c2b9c6f64322f32547abce' 
  AND token = 'tHgXh52Tll8hxiblQcwu3DhpTXOkjt30K54UoVMmETQ=' 
  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"
    }
  }
}