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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0278bfc373aa35fbccc82b0e0d196368ec0c46a9a86354c97df3e9263a8e90ec' 
  AND token = 'jlKG5AkitO03YgZACS9+PQW28GS/3mx2TV+5fnZan1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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