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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bbcb1e864bc85f0f51e672e13e2f2c0dfb330ec7fd333d12f2b079c30d0a18' 
  AND token = 'n25H3Y54mAlKqaTckc6abJ2AvYRhY19ZJSTLc3NlFq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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