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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2712229ffbe4e1a63878b53e07b9994472f61c05b3f28206448f42fd74da4c76' 
  AND token = '5WT/4T3+zDaEU9ENco01zxydkSI0HxhXpuaOgf3Iwwg=' 
  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"
    }
  }
}