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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10e6f94a706d0b53eb9ae82f82049b6ee2c1b69112a921dc5ef9196c0d447bf' 
  AND token = 'zNnLa9YiRwXiY8oMh2LLxV8ugQ1DjNsbEjPykrELvYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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