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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81e47054e18df2b6c78b9514da6a04997bedf8b53ccb3794e3377c3090356b65' 
  AND token = 'sbtAe89/nfi2bSCZpgeW6uPCR2LaLVZftEkZFKQKHgI=' 
  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"
    }
  }
}