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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179ffa464f98a2ccbb464132a41800b5d3e8ada91f36355865bb7b539d08edfd' 
  AND token = 'fs+wcsi+0CHtaE3egL+ZEA4nQaLpn5fiDPJlVnEo9Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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