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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8ce321d062ad63fda3960b777eec140df254be5a8f20772326da48f4463e4a' 
  AND token = 'ZGFuL+5gFKhaQFgJK0fDeqB1KvAZmiEe6mKelkU6WSo=' 
  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"
    }
  }
}