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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e43e9fda75c03451d3d89fba93b4871a91f20de74398d14f0e79229dfd2a40' 
  AND token = '+B+rnQKAGkupKvYerNnjcSWwLIZBmT8hOyF8ud74gL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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