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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4221be083e18f45b0df01a8f1e5859c3b25fdc0aedd92fef430ec7894b7fbd' 
  AND token = 'L+YfyjlwJFFvF1+sEy4U53I5dUEb+JdRPDYfZY5LSqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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