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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4980045c03db968c9b1260ed5c3327cf6396a9bf40fa24f608d6e9dbdc2ba1' 
  AND token = '8d2amzeoijPNIP7ekJqebeZ2OTLm6zAkjWc5TrUoBXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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