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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9736e3aa5122e7e3b762b8344931c0fe6b22b5cde2b847dfe4064d50683771' 
  AND token = 'S+T3g9RNgJ56PqRTtAyV8mygGO2BBl/AWj1j/qAazNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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