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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234492e9e4433eff109e162150c0d5d10238ec963e73c3f7a5ccb187560ae8f4' 
  AND token = '2jQefz3zzOyKdJyal1/nXxzNKaMs8qCp9RvSRfGR00k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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